Cisco Nexus 9504 Hardware Installation Manual page 26

Installing the Bottom-Support Rails
You can expand the rail so that its mounting brackets are spaced between 24 to 32 inches (61.0 to 81.3 cm).
Figure 4: Positioning the Bottom-Support Rails
1 Position two bottom-support rails at the lowest
RU on the rack.
Step 2 Attach the bottom-support rail to the rack or cabinet using a Phillips torque screwdriver on three M6 x 19 mm or 12-24
x 3/4 inch screws for each end of the rail (using a total of 6 screws for the rail as shown in the following figure) and
tighten each screw to 40 in-lbs (4.5 N.m) of torque.
Figure 5: Attaching Bottom-Support Rails to a Rack
Cisco Nexus 9504 NX-OS Mode Switch Hardware Installation Guide
16
2 Allow at least 7.1 RU (12.4 in [31.6 cm]) for
each chassis.
Installing a Chassis